Intermittent feed mechanism



Se t.24,19s5. I. J. LARSON V 2,015,528

INTERMITTENT FEED MECHANI SM Filed Aug. 26, 1953 INVENTOR 7 //V5@ J-M250 ATTORNEY Patented Sept. 24, 1935 UNITED STATES INTERMITTENT FEEDMECHANISM Iner J. Larson, Oaklyn, N. J., assignor to Radio .Corporationof America, a corporation of Delaware Application August 26, 1933,Serial No. 686,873

3 Claims.

This invention relates to intermittent feed mechanism and particularlythe type thereof which is used to feed motion picture filmintermittently past a picture provided either in a camera or in aprojector.

.The particular feed mechanism of this invention is peculiarly adaptedfor use in a camera and more specifically the type of camera used for 16mm. 'film and actuated by-a spring motor.

One object of the invention isto provide an intermittent feed mechanismwhich is operated by a very small amount of power.

Another object of the invention is to provide such an. apparatus whichhas extremely light moving parts for the purpose of decreasing noise andvibration.

Another object of the invention is to provide an intermittent feedmechanism wherein the number of parts requiring extreme precision intheir manufacture is relatively small.

Another object of the invention is to provide an intermittent feedmechanism which is extremely compact in order that the camera case maybe of relatively small dimensions.

. Referring now to the drawing:

Fig. 1 is a top view of the mechanism, and

. 'Fig. 2 isja front view thereof, 1. e. looking toward the mechanismfrom the front of the era.

the mechanism which is journaled in a bushing I I carried in a portionof the frame of the camera 3 The shaft Ill carries fixed thereto the camI3, the cam ll (Fig. 2), the shutter I5, the shutter counterweight l5and the bushing l1, all of which members are assembled into a unit andfixed rigidly t'othe shaft. .The film actuating arm 20 is formed of thinspring steel and is pivoted upon the screw 2,! which is fastened into aportion'of the camera frame 22,,the arm 20 being held spaced from thearm 23 hereinafter described by the bushing 24.,-

The arm 20 has at its outer end a tum-up pin 4 25 shaped to engage theperforations in the film. and it also has a small hemisphericalextrusion 25 to co-operate with'the face of the cam l3. A spring 21assists in maintaining the projection 25 on the arm 25 firmly againstthe cam I3, i which cam thereby provides the in-and-out motion for thepin 25 in relation to the film;

The up-and-down motion of the arm"20 is provided by the arm. which, likethe arm 20, is pivoted on the screw'2l. The arm 23 includes arectangular frame portion 20 having two faces 20 cam- Referring first aFig. 1, in is the drive shaft of adapted to co-operate with the cam IIwhich thereby moves the arm 23 up and down. The arm: 23 is provided witha laterally extending portion 30 which has a snug sliding fittingbetween the turned-up portions 3| on'the arm 20 whereby the outerportion 25 of the arm 20 can be moved in and out by the cam i 3. A

The shutter 5 is constructed in the usual mannero'f thin sheet metal andproperly counterbalanced and is, as usual, timed so as to close the Uaperture during the downward movement of the film.

The operation of the mechanism is obvious from the foregoingdescription. The cam l3 presses the pin 25 into an aperture of the filmat the time the 15 shutter closes, as shown in Fig. 2; the cam M thenmoves the film 2,8 and arm 23, and thereby the arm 20 and the pin 25downwardly to the lowermost position thereof, whereupon the cam I 3permits the spring 21 to withdraw the pin 25 20 from ,the perforation inthe film, the shutter opens and during the exposure of the film the pin25 is returned to its initial position by the action of the cam [4 Whileheld out of contact by the spring 21.

Having described my invention, I claim 1. Intermittent feed mechanismcomprising a pivotally mounted film actuating arm rigid in the directionof film feed and flexible in theperpendicular direction, a springflexing said arm away from the film, a cam for flexing said arm towardthe film, and a coaxially pivoted arm connected to the first arm foractuating said arm about a pivot. v

'2. Intermittent feed mechanism comprising a --pivotally mounted rumactuating arm rigid in the direction of fllmfeed and flexible in theperpendicular direction', a spring flexing said arm away from-the film,a cam for flexing said arm toward the film, an additional arm pivotedco-axially 40 with said first arm' and connected thereto for actuatingsaid first arm about its pivot, and a. second cam actuating the secondarm about the said pivot.

3. Intermittentfeedmechfanism comprising a 4'5 pivotally mounted. filmactuating arm rigid in the direction of film feed and flexible in theperpendicular direction, a spring flexing said arm away from the film,'acam for flexing said arm toward the film, an additional arm pi'vbtedaxially with 50 said first arm for actuating said first arm about itspivot, a second cam actuating the second arm about the said pivot, thesaid arms being slidably connected at the end opposite the said pivot.

mERJ.LARSON.- 65

